We all love morning glories, those blue-purple trumpets that open in abundance in the morning, then fade during the day, only to display a new crop of blooms the next sunny morning. But we all hate field bindweed. Yet, the two are closely related.
The family relationships of morning glories and bindweeds are exceedingly complicated – kind of like trying to figure out how Uncle Ernest is related to Grandma’s sister. Bindweed is Convolvulus arvensis, and the most common garden morning glory is really an Ipomoea. Some bindweeds are in the Calistegia family, but there are even more genera involved in these twining, flowering trumpets.
Let’s say you and I know what a morning glory is: a dazzling, desirable plant in the garden. And its lowly cousin, the bindweed, is a curse.
It is not that bindweed is ugly: Their trumpets are usually a bit smaller and often just plain white. But some have a blushing rose painted in, and could well compete with the showier morning glories if they were not so – well, invasive.
The pop up everywhere and vine themselves around your dahlias and daylilies and whatnot, and smother them. Just when you have hacked the vegetable patch, only days later their peep up again, and show you that all your work was in vain.
It comes out of the ground so dainty and harmless – but don’t be fooled: Scattering their seeds is only the small part of it. Worse is that the teeniest bit of root left in the ground will sprout a whole new plant in no time. That feature makes them a weed – and a weed that in all likelihood won’t be eradicated for good from your garden (or mine).
If the taxonomy and names of morning glories and bindweeds are confusing, so are their origins. Roughly one can say the showy garden morning glories come from the New World, especially Mexico, and bindweeds are Old World inhabitants. Bindweed was introduced to Virginia in the 1700’s, and rapidly spread from there. There is a Mediterranean variety called scammony (Convolvulus scammonia), used as a medicinal plant in Syria.
Bindweed and is mildly poisonous; “mildly poisonous” means you likely will not die but will be sick as a dog and you wish you were dead. Nevertheless, the Aztecs used it as a hallucinogenic – I don’t recommend trying what the Aztecs tried though. Suffice to know that Angel’s trumpet is a relative, too – all morning glories should be handled with caution. Literally handled: Some species, particularly in the subtropics and tropics, are so poisonous that mere contact can make one sick. Livestock might be poisoned, especially by the white roots, if for instance swine dig for the roots.
With all its nauseating toxicity, bindweed has been used as a medicinal plant: A tea from the flowers is good against infections and fevers, and also works as a laxative. Perhaps, to discourage its use, I should call it properly a drastic cathartic, which what it is. It is a cholagogue, meaning it induces the gallbladder to push out bile into the bowels. Nausea and cramps surely are some of its side-effects.
The herb has been laid on festering wounds and promotes healing. But unless you are in bind – umh! – I would prefer comfrey and aloe to heal wounds because we don’t know well enough how much of the bindweed is taken up through a skin sore.
And lastly, bindweed is being investigated as a possible cancer drug. It seems to be an angiogenesis inhibitor, meaning it does not allow a growing tumor to vascularize itself (growing the necessary blood vessel to feed itself) – thus, the cancer is starved. But it sound more straightforward than it is – again, I wouldn’t try this at home.
Bindweed, invasive and frustrating. But it might have its redeeming sides. Nothing on which we should use Round-up (which we should use on NOTHING!!) – just investigate its usefulness. Read More
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Invasive Plants 2: List
October 11, 2011
My home state publishes a list on invasive species for Massachusetts, and also defines which criteria a plant has to meet to be labeled “invasive”:
1. It is not native to Massachusetts
2. Must have the “biologic potential for rapid and widespread dispersion and establishment”
3. Must have the “biologic potential for dispersing over spatial gaps away from the site of introduction”
4. Must have the “biologic potential for existing in high numbers” away from gardens
5. Must have been introduced to Massachusetts already
The real text is a bit more cumbersome and bureaucratic – but we get the idea. There are tons of species on the lists, but here are a few from the list I would add to my list (this is arbitrary and based on my very personal experiences as a gardener at a single spot in Massachusetts – you might have a different opinion; it is worthwhile finding the list of invasive plants for your state!):
1. Japanese barberry – it stayed a single beautiful bush in my garden. But of course I can’t know to which places birds dispersed its seeds
2. Bittersweet. There are two bittersweets, with orange berries. One Celastrus scandens, the "American bittersweet" is non-invasive. The Asian or Oriental bittersweet is Celastrus orbiculatus, highly invasive. And it is the plant I called euonymus which I was familiar with from Europe. It seems, celastrus and euonymus are related species, and it is really the Celastrus orbiculatus that is so overly invasive. This vine’s berries are spread by birds, and the plant can strangle even trees. One of the worst I know – I would not plant it, and I am hacking it down wherever I meet it.
3. Purple loosestrife: Years ago, I bought a “butterfly bush” by mail order. It turned out to be purple loosestrife. As much as I try to eradicate it, it comes always up somewhere.
4. Wild rose (Rosa multiflora) is pretty while in bloom. But it flowers only once, and after flowering I always cut it of so it doesn’t set seeds. The rootstock, however – I’ll never get it out of my garden again.
5. Privet (Ligustrum vulgare) – it was in my garden when I moved in. It also might be another species as they are notoriously hard to identify. As often as I cut it back, it always pops up again.
6. Pennisetum, a vertically striped grass. Beautiful white and green. It is not invasive according to the Massachusetts definition, but like wisteria, it wants to take over my garden. There is a horizontally striped grass (Miscanthus sinensis) that might also become invasive – luckily, I never planted it.
7. White mulberry (Morus alba). Twice I planted a mulberry tree in my garden – mail orders. Twice they were not what they were advertised at: black mulberries. I wanted one in my garden desperately so that for once we can harvest our cherries before the birds do. Twice I had to hack down the tree because it grew as fast as Jack’s beanstalk – and did not deliver.
Now, our alphabetical list looks like this:
1. Bamboo (more than 70 genera in the Poaceae family)
2. Bermuda grass (Cynodon dactylon, also: Panicum dactylon, Capriola dactylon)
3. Bindweed (many species from the Convolvulus or Calystegia families)
4. Bittersweet (Celastrus orbiculatus)
5. Blackberries (Rubus spp.)
6. Burdock (Arctium lappa, and other species of Arctium)
7. Canada thistle (Cirsium arvense)
8. Chickweed (Stellaria spp.)
9. Crab grass (Digitaria spp. )
10. Dandelion (Taraxum officinale)
11. Ground ivy (Glechoma hederacea, also: Nepeta glechoma, Nepeta hederacea)
12. Japanese barberry (Berberis thunbergii)
13. Johnson grass (Sorghum halepense)
14. Kudzu (Pueraria lobata)
15. Miscanthus (Miscanthus sinensis)
16. Nightshade vine, bittersweet nightshade (Solanum dulcamara)
17. Pachysandra (Pachysandra terminalis)
18. Pennisetum (Pennisetum spp.)
19. Pokeweed (Phytolacca americana)
20. Privet (Ligustrum vulgare).
21. Purple loosestrife (Lythrum salicaria)
22. Purslane (Portulaca oleracea)
23. Quackgrass, also: couch grass (Elytrigia repens, also: Triticum repens, Agropyron repens, Elymus repens)
24. Raspberries (Rubus spp. – like the blackberries)
25. White mulberry (Morus alba)
26. Wild rose (Rosa multiflora)
27. Wild wine (Vitis labrusca)
28. Wisteria (Japanese: Wisteria floribunda; Chinese: Wisteria sinensis)
29. Wormwood (Artemisia absynthium)
Sorry, compiling all this, takes longer than thought. In the next installment, we will hopefully discover the medicinal value of some of these invasive plants – the idea being, if we harvest and eat them, they will be less invasive. Read More
The 10 Worst Garden Weeds – Really?
October 10, 2011
According to a survey of the “Mother Earth News” (“The original guide to living wisely”) the following are the ten weeds that make life for the nation’s vegetable gardeners miserable:
1. Crab grass
2. Dandelion
3. Bermuda grass
4. Bindweed
5. Chickweed
6. Ground ivy
7. Canada thistle
8. Burdock
9. Quackgrass
10. Johnson grass
Add to these another ten plants that I wish I had never planted in my own Massachusetts garden – or that arrived on their own out of nowhere:
1. Wisteria
2. Wild wine
3. Raspberries
4. Blackberries
5. Wormwood
6. Pachysandra
7. Euonymus
8. Deadly nightshade
9. Purslane
10. Pokeweed
I wonder why kudzu isn’t mentioned – we hear that is stealthily covers all of the South, a mile a minute. Why is kudzu not mentioned?? And bamboo??
Let’s sort them alphabetically:
1. Bamboo
2. Bermuda grass
3. Bindweed
4. Blackberries
5. Burdock
6. Canada thistle
7. Chickweed
8. Crab grass
9. Dandelion
10. Deadly nightshade
11. Euonymus
12. Ground ivy
13. Johnson grass
14. Kudzu
15. Pachysandra
16. Pokeweed
17. Purslane
18. Quackgrass
19. Raspberries
20. Wild wine
21. Wisteria
22. Wormwood
But – stop right here! Putting up lists of invasive plants and policing them – that’s not good gardening and not good stewardship of the Earth. Let’s assume for a moment that these plants all serve a purpose – or as Sebastian Kneipp put it: “God lets an herb grow for every ailment we complain about.”
Tomorrow, I will go through the list and try to divine the purpose behind each plant. Read More